Telomerase quantification

Hi there! I am using the TRAP assay to measure telomerase activity but
in order to quantify the activity it requires the use of a
phosphorimager. I am thinking about buying one, does anyone have any
advice? Is the InstantImager from Packard better? (I also do
Northern blotting as well) Any suggestions or wise words of wisdom would
be greatly appreciated. Thanks.
Jackie